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Unknown Known (UNKNOWN (アンノウン) KNOWN (ノウン) An'nōn Nōn) is the two hundred and thirteenth chapter of the Dr. Stone manga.


The dam begins operations, starting the source of the Kingdom of Science's large-scale power production. More people are revived, and Gen puts on shows to get everyone up to speed on their story so far. The topic of entertainment gets Ryusui excited, prompting him to mention using the control of the media as a way of controlling the world.

They build a CRT television and everyone is enthusiastic to watch shows, until they realize there's nothing being broadcast. Instead, they use the CRT as a screen for SAL 9000— their completed computer, delivered to Japan from their friends in Corn City. Sai rapidly begins programming punch cards, allowing everyone to play video games on the computer.

Later, Sai and Ryusui play a game of chess against one another, with Sai using an AI rather than playing himself. Ryusui loses, and comments that the AI has already surpassed his human intellect. In the meanwhile, the others lock the Petrification Weapon in a safe, covered with a glass dome and in a vacuum. Before they can leave, Gen and Yo hear some noises coming from inside and go to check, but before they can open the safe, the device activates, petrifying them both. Yo's statue shatters.

Characters in Order of Appearance[]

Chapter Notes[]

  • More pre-petrification humans are revived.
    • Gen puts on a show to update them on the situation.
  • A television set in created with a CRT screen.
    • This uses the same technology as their radar, with an extra step.
  • Sai recreates Tetris, Pac Man, Gyruss+Tempest, and Galaga+Asteroids.
  • The petrification device goes off after being sealed in a vacuum within a safe.
  • Yo and Gen are petrified.
    • Yo shatters.


  • Ryusui mentions Google and Netflix by name. They aren't censored like Rolex/Rodex was in chapter 177.

Site Navigation[]

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Chapters and Volumes
Volume 1 1234567Extras
Volume 2 89101112131416Extras
Volume 3 17181519202122232425Extras
Volume 4 262728293031323334Extras
Volume 5 353637383940414243Extras
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Volume 17 143144145146147148149150151Extras
Volume 18 152153154155156157158159160Extras
Volume 19 161162163164165166167168169Extras
Volume 20 170171172173174175176177178Extras
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Volume 23 197198199200201202203204205Extras
Volume 24 206207208209210211212213214Extras
Volume 25 215216217218219220221222223Extras
Volume 26 224225226227228229230231232Extras
Volume 27 Terraforming4D Science: 14D Science: 24D Science: 3
[v  e]
Story Arcs
Prologue Saga
Stone Formula Arc
Chapters 1234
Episodes 12
Vs. Tsukasa Arc
Chapters 56789101112
Episodes 345
Ishigami Village Saga
Kingdom of Science Arc
Chapters 131415161718192021222324252627282930313233
Episodes 5678910111213
Village Games Arc
Chapters 34353637383940
Episodes 131415
Village Origins Arc
Chapters 4142434445
Episodes 1617
Stone Wars Saga
Vs. Hyoga Arc
Chapters 4647484950
Episodes 1819
Communications Arc
Chapters 5152535455565758596061626364656667686970717273747576777879808182
Episodes 20212223242526272829303132333435
Source of the Petrification Saga
Age of Exploration Arc
Chapters 8384858687888990919293949596979899 100
Episodes 35Ryusui3637383940
Treasure Island Arc
Chapters 101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138
Episodes 4142434445464748495051525354
The Truth of the Petrification Saga
New America City Arc
Chapters 139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169
Episodes 555657
South America Arc
Chapters 170171172173174175176177178179180181182183184185186187188189190191192193
New Stone World Arc
Chapters 194195196197198199200
Globetrotting Arc
Chapters 201202203204205206207208209210211212
Stone to Space Saga
Moon Mission Arc
Chapters 213214215216217218219220221222223224225226227228229230231232